[sakai2-tcc] Captcha support 2.8 for new accounts

[Seth Theriault]

Steve Swinsburg wrote:

> I like the recaptcha version (SAK-12489) and assuming it's all 
> ready to go, would like to see this in 2.8.

I must remind everyone that the deadline for documenting new 
things to be added for 2.8 was September 8, 2010.

Based on previous experience, I think it would be a mistake to 
rush things into the release.

Seth